1

AC joint.:
The rotator cuff injury would not give you that lump. It may be an arthritic, or inflammed, acromioclavicular joint. See an orthopedic sport medicine surgeon, who specializes in shoulders.
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The rotator cuff is a group of four muscles that wrap around the ball of the ball and socket joint f the shoulder. The cuff muscles initiate the movements of internal and external rotation as well as lifting your arm from your side (abduction).
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2

Possibly:
The rotator cuff is located beneath both the acromion and the clavicle. The body has a tough time deciding where the pain is because of the low density of nerve fibers and organs in the area. Therefore rotator cuff pain can be across the back, in the clavicle or down the arm. You should get it checked out.
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Latisimus strain:
This is best diagnosed with a hands on exam but sounds like your latisimus dorsi muscle is strained. Rotator cuff is often achy down the side of the deltoid, back of shoulder, or front of shoulder. But, it is possible. Get an examination to be specific.
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6

Most not related.:
I can;t think of any reason that a fingr tip injury would cause a lump in the palm. Lumps, bumps and masses are very common in the palm and hand. You should probably see a hand surgeon for a diagnosis.
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Begin gentle ROM:
With a nondisplaced radial head fracture, I treat only with an ace and sling. After ten to fourteen days with no change in position by Xray, I start the patient on gentle active range of motion. The important thing about radial head fractures is the prolonged immobilization of the elbow may cause permanent stiffness.
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10

Unlikely:
Fat necrosis is one of the common causes of a nodule in the skin after trauma. Cancer usually does not develop within weeks, so that seems unlikely. Was it possible there was lump there before, and you only notice it now after the injury? Without an age, there are some other possibilities that could be seen: gout, arthritis, etc.
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12

Varies:
There are a number of possibilities; from an enlarged lymph node, to a growth of a tumor or an infectious process among other possibilities. If it is red, painful, enlarging you should probably be seen immediately. If it is not, you could potentially moniter it and if it does not resolve over 4 weeks be seen. It is hard to say more without a direct examination.
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16

Ganglion:
This sounds like a ganglion cyst also known as a retinacular cyst. This is a fluid filled sac that comes from the tendons that bend down the fingers. To confirm the diagnosis i would recommend trying to remove the fluid with a needle. These usually go away, sometimes they require surgery to remove.
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17

No:
The two have minimal affect upon the other. There are cases where a surgery for the rotator cuff tear (arthroscopy with rotator cuff repair) causes enough swelling in the hand. The swelling can cause "triggering", or stiffness in the index finger. Just a torn rotator cuff can on rare occasions cause the same problem. Other surgeries to the shoulder, elbow, or wrist can do the same.
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20

Mass:
You will need to follow up with your family physician to evaluate. There could also be need a need for a General Surgery referral for biopsy of the pea size masses. But because you are giving me limited information ( I do not know the consistency or shape or color), it is best that you follow up with a physician so they can do the necessary tests and visual assessment.
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